appveyor: Add remote desktop snippet

Signed-off-by: Kenji Okimoto <okimoto@clear-code.com>

Author: okkez

appveyor.yml

@@ -1,4 +1,8 @@
 version: '{build}'
+
+# init:
+#   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
 install:
   - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
   - "%devkit%\\devkitvars.bat"